Formulated silhouettes for sketching terrain

Whelan, J. C.; Visvalingam, M.

Abstract

The mathematical definition of silhouettes within NPAR is based on the assumption that they are the eye-centered projections of occluding contours on an imaging plane. However, occluding contours are insufficient for sketching the silhouettes of hills as drawn by cartographers. The research reported in this paper is based on the proposition that silhouettes are mental visualizations of the outlines of objects that arise from knowledge and experience of the visual world. This paper does not seek to provide an alternative definition of silhouettes. Instead, it tests the proposition that missing silhouette elements should be drawn on those visible surfaces brought into view through adoption of a higher viewpoint.

Citation

Whelan, J. C., & Visvalingam, M. (2003, June). Formulated silhouettes for sketching terrain. Presented at Theory and Practice of Computer Graphics, TPCG 2003, Birmingham, UK

• Presentation Conference Type: Conference Paper (published)
• Conference Name: Theory and Practice of Computer Graphics, TPCG 2003
• Start Date: Jun 5, 2003
• End Date: Jun 5, 2003
• Online Publication Date: Jun 25, 2003
• Publication Date: Jun 25, 2003
• Deposit Date: Aug 27, 2021
• Publisher: Institute of Electrical and Electronics Engineers
• Pages: 90-96
• Book Title: Proceedings of Theory and Practice of Computer Graphics, 2003
• ISBN: 0769519423; 9780769519425
• DOI: https://doi.org/10.1109/TPCG.2003.1206935
• Public URL: https://hull-repository.worktribe.com/output/3635801